Really love the series and hope it doesn't stop at episode 12 - it could but it would be such a disappointment. I started reading the manga online but the story line doesn't continue much further as far as i can tell but that can be due to only having a few more editions translated.

I really hope there is a season 2 also!! But, no matter how much I look.. I can't seem to find the answer anywhere.. I'm not sure if it's true or not but, I heard another book to the anime is coming out again soon.. so, maybe they'll make a season 2.. (if they have enough storyline to follow) I don't know... but, I really hope there is! (Sorry that this wasn't really an answer to your question though o.o)

I know that I'm replying to this kind of late, but I thought that I would through in my two cents anyway. The wikipedia page says that the anime is over, but the manga isn't. Unlike a written work, such as a manga, a TV show only lasts as long as it makes money, so my guess would be that the television publisher that owns the TV rights to the story didn't make enough money off of it to consider a continuation. But this is just my speculation, it could just be that there haven't been enough manga chapters created to start on a second season, but who knows.

Most of the time a series of that nature ends up usually being one season, leaving the rest up to read the manga to fill in the remaining bits. I'm honestly glad they ended the series as they did. There's always hope for a 2nd season but don't hold your breath. In the meantime, hunt down the manga! ^+^

Leaving this as a one-season series kind of makes sense for the sudden turn the story made. This season could have had a lot more potential with fighting scenes / stories. It's almost like some a**hole came along and was like, "BLARGH This show isn't getting enough ratings, let's default the story to a love based scenario with the letters!"

The last ep. did however conclude with, "The story moves from spring to summer." so I'd assume a potential second season has not been completely ruled out.

I hope they do make a second season. I love this show! And I believe there is a part two that would make it even more action oriented since for the most part, this show wasn't. That might attract more viewers if they did it that way, but this is just my opinion since I don't know too much about marketing...

I don't think that there will be a second season though I hope there will be.
I really really like this anime so much especially in the episode 11 and 12.
The end to Inu x Boku Secret Service literally ripped the heart out of my chest.